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鄂尔多斯盆地致密砂岩储层可动流体赋存特征及其影响因素
闫健,秦大鹏,王平平,王海华
0
(1.西安石油大学石油工程学院,陕西西安710065;2.陕西省油气田特种增产技术重点实验室,陕西西安710065;3.中国石油长庆油田分公司第六采油厂,陕西西安718600)
摘要:
致密砂岩储层流体分布特征复杂,可动流体参数是评价流体分布和渗流特征的关键指标。基于低场核磁共振原理,辅以高压压汞、X-射线衍射和扫描电镜实验,以鄂尔多斯盆地吴起油田长7储层为研究对象,对30块岩心开展可动流体测试分析,将储层划分为Ⅰ,Ⅱ和Ⅲ共3种类型,并建立了分类标准,定量评价了3类储层中不同孔隙半径孔隙内可动流体赋存量,并对可动流体赋存特征的影响因素进行了分析。研究结果表明:3类储层对应的大孔隙发育程度、孔喉连通性和可动流体赋存量依次降低,可动流体赋存特征存在较大差异,Ⅰ,Ⅱ和Ⅲ类储层可动流体饱和度平均值分别为50.35%,42.00%和21.40%;其中Ⅰ和Ⅱ类储层可动流体参数相近,且可动流体赋存量大,是未来勘探开发的主要方向。可动流体主要赋存于孔隙半径为0.053~0.527 μm的Ⅰ和Ⅱ类储层中。渗透率和中值半径是影响储层可动流体特征的主要因素,但Ⅰ和Ⅱ类储层可动流体主要还受孔隙度、大孔隙孔隙度、分选系数、有效孔隙度和黏土矿物的影响;而Ⅲ类储层影响因素多且杂,并未发现明显的主要影响因素。
关键词:  致密砂岩  核磁共振  可动流体参数  微观孔隙结构  鄂尔多斯盆地
DOI:10.13673/j.cnki.cn37-1359/te.2020.06.006
基金项目:国家自然科学基金青年科学基金项目“致密气藏开发中气水相渗影响机制及曲线校正”(51404197)。
Occurrence characteristics and main controlling factors of movable fluid in tight sandstone reservoirs in Ordos Basin
YAN Jian,QIN Dapeng,WANG Pingping,WANG Haihua
(1.College of Petroleum Engineering,Xi’an Shiyou University,Xi’an City,Shaanxi Province,710065,China;2.Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs,Xi’an City,Shaanxi Province,710065,China;3.No.6 Oil Production Plant,Changqing Oilfield Company,PetroChina,Xi’an City,Shaanxi Province,718600,China)
Abstract:
The fluid distribution characteristics of tight sandstone reservoir are complicated,and the movable fluid parameters are important to evaluate the fluid distribution and percolation characteristics. Based on the low-field nuclear magnetic resonance(NMR),high pressure mercury injection capillary pressure(MICP),X-ray diffraction,and scanning electron microscope(SEM)experiments,the movable fluid in 30 core samples collected from Chang7 Member of Wuqi Oilfield in Ordos Basin are analyzed. The reservoirs can be divided into three types:Ⅰ,ⅡandⅢ,and the division standard is established. The amount of movable fluid in the pores with different pore radius of three types of reservoirs is quantitatively evaluated and the influencing factors of the movable fluid are analyzed. The results show that the macropore,pore throat connectivity and the amount of movable fluid decrease in sequence. There are large differences in the occurrence characteristics of movable fluid. The average values of movable fluid saturation in typeⅠ,typeⅡand typeⅢreservoirs are 50.35%,42.00% and 21.40%,respectively. The main direction of exploration and development in the future is typeⅠandⅡreservoirs,which have a large amount of similar movable fluid. The movable fluid of the target reservoir mainly distribute in the pores with the radius of 0.053-0.527 μm in typeⅠandⅡreservoirs. Permeability and median radius are the main factors that affect the characteristics of the movable fluid,in typeⅠandⅡreservoirs,the movable fluid is also affected by porosity,macropore porosity,sorting coefficient,effective porosity and clay minerals. However,there are many and complex influencing factors in typeⅢreservoir,and no obvious influencing factors have been found.
Key words:  tight sandstone  nuclear magnetic resonance(NMR)  movable fluid parameters  micropore structure  Ordos Basin

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